循环冷却水DSA电极电化学除垢中试试验  

Pilot Scale Experiment of DSA Electrochemical Descaling for Recirculated Cooling Water Treatment

作　　者：周福伟 周小燕 王蛟平 张刚[1] ZHOU Fuwei;ZHOU Xiaoyan;WANG Jiaoping;ZHANG Gang(School of Civil Engineering and Architecture,University of Jinan,Jinan 250022,China;Tong Yuan Design Group Co.,Ltd.,Jinan 250101,China;Jinan Urban Construction Group Co.,Ltd.,Jinan 250031,China)

机构地区：[1]济南大学土木建筑学院,山东济南250022 [2]同圆设计集团股份有限公司,山东济南250101 [3]济南城建集团有限公司,山东济南250031

出　　处：《净水技术》2022年第1期90-95,共6页Water Purification Technology

基　　金：山东省自然科学基金(ZR2017MEE061)。

摘　　要：以华北地区某机场中央空调循环冷却水为处理对象,进行了DSA电极电化学除垢中试试验。试验结果表明:工艺最佳运行工况是电流密度为25.56 A/m^(2)、停留时间为4.0 min,硬度含量由进水的225.62 mg/L降至174.02 mg/L,比能耗为119.09 kW·h/kg;与实验室小试相比,阻垢剂的存在对除垢效果无显著影响,但不利于阴极水垢沉积物的去除。SEM结果表明阴极水垢的形状不规则,而XRD分析表明阴极沉积物主要以方解石的形式存在。研究成果表明电化学除垢工艺能够有效降低循环冷却水的硬度,是一种环保、低成本除垢工艺。A pilot scale DSA electrode electrochemical reactor was applied in a central air conditioning recirculated cooling water descaling of an airport in North China. Results showed that optimal operating condition was current density of 25.56 A/m;and residence time of 4.0 min, hardness content decreased from 225.62 mg/L to 174.02 mg/L, and energy consumption ratio was 119.09 kW·h/kg. Different from laboratory experiment, the presence of scale inhibitor had little significant effect on descaling effect, and was not conducive to the removal of cathodic scale deposits. SEM results showed that the shape of cathode scale was irregular, and XRD analysis showed that cathode deposits mainly existed in the form of calcite. Results indicated that electrochemical bypass descaling technology can not only effectively reduce the hardness of circulating cooling water, but also become an environmentally friendly and low-cost descaling process.

关 键 词：形稳型阳极(DSA) 电化学除垢 循环冷却水 停留时间 电流密度 比能耗 

分 类 号：X703[环境科学与工程—环境工程]